You are in need of a power supply that can be used for both AC and DC, most switching power supplies can be used for both AC and DC at present, except for those with an industrial frequency transformer at the input, this is due to the fact that AC-DC power supplies have a rectifier bridge inside, which can support DC input. Generally DC is also a higher voltage, and there are few matched DC power supplies. It still depends on your application.
With a typical 220V AC power supply, the input DC is also going to be about 300V. The average DC power supply rarely goes that high. I've seen an AC-DC power supply with a wide input voltage range down to about 30 V. The PA1HB5OD-6W from Zi Yuan Electronics has an input range of about AC: 30V to 280VAC, and DC voltage: 30V to 400VDC. this power supply should be better suited for you.